<template>
  <h4>当前求和为:{{ sum }}</h4>
  <button @click="sum++">点我++</button>
  <hr>
  <h2>姓名:{{ name }}</h2>
  <h2>年龄:{{ age }}</h2>
  <h2>薪资:{{ job.j1.salary }}K</h2>
  <button @click="name += '~'">修改姓名</button>
  <button @click="age++">修改年龄</button>
  <button @click="job.j1.salary++">涨薪</button>
</template>

<script>
import { ref, reactive, toRefs, readonly, shallowReadonly } from "vue"; // ref处理基本类型数据  reactive处理引用类型数据
export default {
  name: "demo",
  setup() {
    let sum = ref(0)

    let person = reactive({
      name: "张三",
      age: 18,
      job: {
        j1: {
          salary: 20
        }
      }
    })

    person = readonly(person) // person里的属性值都不能修改 ... 名字，年龄，涨薪 都点击不了
    // person = shallowReadonly(person) // person第一层属性不能修改,深层次的可以改。也就是说，名字和年龄不能改，涨薪可以改
    sum = shallowReadonly(sum) // sum++执行不了

    return {
      sum,
      ...toRefs(person)
    };
  },
};
</script>


